Which of the Following Is a Reason That Astronomers Have

question 19

Multiple Choice

Which of the following is a reason that astronomers have not found giant planets with the orbit of Neptune around other stars?

• A) our theories suggest that orbits as far away from a star as Neptune are never stable (and the presence of Neptune in our own solar system is a big mystery)
• B) Neptune takes 165 years to go around the Sun; getting information about just one cycle of such a planet's orbit around another star would take astronomers 165 years
• C) at the orbit of Neptune, only very low-mass planets (smaller than Mercury) can form
• D) the method we are using to find planets currently can only reveal low-mass planets, while we expect high-mass planets at the orbit of Neptune
• E) you can't fool me; we have already found several planets as far from their stars as Neptune is from the Sun

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